Erysiphe betulina U. Braun & S. Takam. [2000011]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-02-28); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Uncinula betulae Homma; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula betulae Homma. Type: Uncinula betulae Homma.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [523-524] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia. Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Betula platyphylla [Sukaczev] var. japonica (Miq.) Hara; Betula, Betulaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.125 mm in diam.. Margin: External filaments present (width subequal throughout or somewhat irregular, occasionally somewhat wider in the upper half, often slightly enlarged at the base); uncinate (closely) or circinate, 1-2 µm long, 4.5-7 µm in diameter, hyaline or faintly pigmented (occasionally at the base), numerous, 15-40 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or somewhat rough (below), thin or thick (towards the base), not ramified, septate (0-1-septate).

Asci: 4-12 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-6-8 per ascus, subglobose, ellipsoid, or ovoid, 18-28 µm long, 9-17 µm wide; septa absent.

(report generated 04.Okt.2007)